Acquisition (Details) (USD $)	0 Months Ended
	Sep. 25, 2013	Oct. 31, 2013	Jan. 31, 2013
Acquired Finite-Lived Intangible Assets [Line Items]
Purchase price paid in cash	$ 9,000,000
Identifiable intangible assets	4,700,000
Net deferred tax liability	700,000
Net liabilities assumed	700,000
Goodwill		5,734,000	0
Identifiable intangible assets acquired	4,730,000
Developed Technology
Acquired Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets acquired	2,940,000
Identifiable intangible assets, useful life	36 months
Customer Relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets acquired	1,460,000
Identifiable intangible assets, useful life	36 months
Other acquired intangible assets
Acquired Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets acquired	$ 330,000
Identifiable intangible assets, useful life	24 months